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Watts 3 LF3100 dielectric flange, silver zinc-plated galvanised brass and cast iron, four bolt holes

Watts

Watts 3 LF3100 Dielectric Flange 3 Inch FIP Solder 175 psi

SKU CH-9GR5-M4NJP

A dielectric flange that separates dissimilar metals in plumbing systems, rated for 175 psi and temperatures from 33 to 180 degrees Fahrenheit

  • Product typeDrain Components
  • Main materialCopper, Iron
  • Prevents galvanic corrosion with polysulfone insulator
  • Handles 175 psi maximum operating pressure
  • Operates from 33 to 180 degrees Fahrenheit
  • Connects FIP threaded to solder joint
  • Durable copper and iron construction

Dielectric Flange 3 Inch FIP Solder

The Watts LF3100 dielectric flange separates dissimilar metals in plumbing systems to prevent galvanic corrosion. It connects a 3 inch female iron pipe thread to a solder joint and is rated for 175 psi maximum operating pressure. The fitting suits new installations or repairs where copper and iron piping meet.

Sustained Pressure and Temperature Range

The flange handles continuous service between 33 and 180 degrees Fahrenheit at its rated pressure. Polysulfone insulation maintains dielectric separation across this thermal span without degrading. Performance remains stable under constant load rather than only during brief test spikes.

Cast Iron and Brass Construction

The body combines zinc-plated galvanized cast iron with brass components for mechanical strength and corrosion resistance. Four bolt holes allow secure mounting to mating flanges using standard hardware. Fasteners are not included so installers select bolts suited to the specific piping assembly.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $310.99
Pricier than about 90% of the 4,240 comparable items (median $31.99).

Specifications

Product
Brand nameWatts
Model name3 LF3100
Product typeDrain Components
Size & build
Main materialCopper, Iron

Questions about this item

How much heat can the polysulfone insulator on the 3 LF3100 handle during continuous operation?

The insulator is rated for 33 to 180 degrees F, so it will tolerate typical hot-water temperatures all day.

What pipe connections must already be in place for the 3-inch FIP-by-solder flange to install?

You need a 3-inch female threaded pipe on one side and a 3-inch copper tube ready for soldering on the other.

Will the zinc-plated galvanized and brass flanges corrode when joined to older cast-iron piping?

The dielectric design with polysulfone insulation separates dissimilar metals, preventing galvanic corrosion with existing cast iron.

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